/* ===========================================
   IVAN FERRERO DASHBOARD — DESIGN SYSTEM
   =========================================== */

:root {
    /* Background */
    --bg-primary: #0a0e14;
    --bg-secondary: #0f1419;
    --bg-tertiary: #151b23;
    --bg-card: #1a222d;
    --bg-hover: #222c3a;
    
    /* Text */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    /* Accents */
    --accent-cyan: #00d9ff;
    --accent-cyan-dim: #00d9ff40;
    --accent-green: #3fb950;
    --accent-yellow: #d29922;
    --accent-orange: #db6d28;
    --accent-red: #f85149;
    --accent-purple: #a371f7;
    
    /* Borders & Effects */
    --border-color: #30363d;
    --border-accent: #00d9ff30;
    --gradient-cyber: linear-gradient(135deg, #00d9ff15 0%, #3fb95010 100%);
    --shadow-glow: 0 0 30px #00d9ff15;
    
    /* Typography */
    --font-display: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* ===========================================
   BASE
   =========================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

/* Background Grid Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.15;
    pointer-events: none;
    z-index: -1;
}

/* ===========================================
   TYPOGRAPHY
   =========================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; margin-bottom: 1.5rem; }
h2 { font-size: 1.8rem; margin-bottom: 1.25rem; }
h3 { font-size: 1.4rem; margin-bottom: 1rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.75rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

code, .mono {
    font-family: var(--font-mono);
}

/* ===========================================
   LAYOUT
   =========================================== */

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

.main-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 5rem 2rem 2rem;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    min-height: 100vh;
}

/* Single column variant */
.main-container.single-column {
    grid-template-columns: 1fr;
    max-width: 1200px;
}

/* ===========================================
   HEADER
   =========================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border: 2px solid var(--accent-cyan);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
}

.logo-text {
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.logo-text span {
    color: var(--accent-cyan);
}

/* ===========================================
   NAVIGATION
   =========================================== */

.main-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.nav-btn.active {
    color: var(--accent-cyan);
    background: var(--accent-cyan-dim);
    border-color: var(--accent-cyan);
}

/* ===========================================
   SIDEBAR
   =========================================== */

.sidebar {
    position: sticky;
    top: 5rem;
    height: calc(100vh - 6rem);
    overflow-y: auto;
    padding-right: 1rem;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    padding-left: 0.75rem;
}

.sidebar-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.sidebar-link:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.sidebar-link.active {
    color: var(--accent-cyan);
    background: var(--accent-cyan-dim);
}

/* ===========================================
   CARDS
   =========================================== */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.2s ease;
}

.card:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-glow);
}

.card h3 {
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
}

/* Expandable Card */
.card.expandable .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.card.expandable .card-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.card.expandable.expanded .card-body {
    max-height: 2000px;
}

.card.expandable .expand-icon {
    color: var(--accent-cyan);
    font-size: 1.2rem;
    transition: transform 0.2s ease;
}

.card.expandable.expanded .expand-icon {
    transform: rotate(45deg);
}

/* Stat Card */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

/* ===========================================
   TAGS
   =========================================== */

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 4px;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.tag-cyan {
    background: var(--accent-cyan-dim);
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
}

.tag-green {
    background: #3fb95020;
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.tag-yellow {
    background: #d2992220;
    color: var(--accent-yellow);
    border: 1px solid var(--accent-yellow);
}

.tag-orange {
    background: #db6d2820;
    color: var(--accent-orange);
    border: 1px solid var(--accent-orange);
}

.tag-red {
    background: #f8514920;
    color: var(--accent-red);
    border: 1px solid var(--accent-red);
}

.tag-purple {
    background: #a371f720;
    color: var(--accent-purple);
    border: 1px solid var(--accent-purple);
}

/* ===========================================
   TABS
   =========================================== */

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--accent-cyan);
    background: var(--bg-card);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===========================================
   SECTIONS
   =========================================== */

.section {
    display: none;
}

.section.active {
    display: block;
}

.subsection {
    margin-bottom: 3rem;
}

.subsection h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* ===========================================
   FORMS & INPUTS
   =========================================== */

.search-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--accent-cyan-dim);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* ===========================================
   BUTTONS
   =========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border: none;
}

.btn-primary:hover {
    background: #00c4e6;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--accent-cyan);
}

/* ===========================================
   GLOSSARY
   =========================================== */

.glossary-grid {
    display: grid;
    gap: 1rem;
}

.glossary-item {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
}

.glossary-item.visible {
    display: block;
}

.glossary-item h4 {
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.glossary-item .definition {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.glossary-item .application {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===========================================
   BIBLIOGRAPHY
   =========================================== */

.bib-section {
    margin-bottom: 1.5rem;
}

.bib-section h4 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.bib-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.bib-item:last-child {
    border-bottom: none;
}

.bib-item em {
    color: var(--text-primary);
}

/* ===========================================
   PROGRESS BAR
   =========================================== */

.progress-container {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--bg-secondary);
    z-index: 999;
}

.progress-bar {
    height: 100%;
    background: var(--accent-cyan);
    width: 0%;
    transition: width 0.1s ease;
}

/* ===========================================
   UTILITIES
   =========================================== */

.text-cyan { color: var(--accent-cyan); }
.text-green { color: var(--accent-green); }
.text-yellow { color: var(--accent-yellow); }
.text-orange { color: var(--accent-orange); }
.text-red { color: var(--accent-red); }
.text-purple { color: var(--accent-purple); }
.text-muted { color: var(--text-muted); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* ===========================================
   RESPONSIVE
   =========================================== */

@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        padding-top: 4rem;
    }
    
    .sidebar {
        position: static;
        height: auto;
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        padding-right: 0;
        margin-bottom: 2rem;
    }
    
    .sidebar-section {
        margin-bottom: 0;
    }
    
    .sidebar-title {
        display: none;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.4rem; }
    h3 { font-size: 1.2rem; }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}